1 /*
   2  * Copyright (c) 2019, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 package runtime.valhalla.valuetypes;
  25 
  26 /*
  27  * @test VolatileTest
  28  * @summary check effect of volatile keyword on flattenable fields
  29  * @modules java.base/jdk.internal.misc
  30  * @library /test/lib
  31  * @run main/othervm runtime.valhalla.valuetypes.VolatileTest
  32  */
  33 
  34 import jdk.internal.misc.Unsafe;
  35 
  36 import java.lang.reflect.*;
  37 import jdk.test.lib.Asserts;
  38 
  39 public class VolatileTest {
  40     static final Unsafe U = Unsafe.getUnsafe();
  41 
  42     static inline class MyValue {
  43         int i = 0;
  44         int j = 0;
  45     }
  46 
  47     static class MyContainer {
  48         MyValue mv0;
  49         volatile MyValue mv1;
  50     }
  51 
  52     static public void main (String[] args) {
  53         Class<?> c = MyContainer.class;
  54         Field f0 = null;
  55         Field f1 = null;
  56         try {
  57             f0 = c.getDeclaredField("mv0");
  58             f1 = c.getDeclaredField("mv1");
  59         } catch(NoSuchFieldException e) {
  60             e.printStackTrace();
  61             return;
  62         }
  63         Asserts.assertTrue(U.isFlattened(f0), "mv0 should be flattened");
  64         Asserts.assertFalse(U.isFlattened(f1), "mv1 should not be flattened");
  65     }
  66 }